is it possible to use a little servo with Duet 2 WiFi?
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@thedragonlord As long as the servo reaches it's endposition without buzzing it won't draw much current while it isn't moving. So, you could use BLTouch and Servo, (but not at the same time) without an external 5V supply.
A hobby servo from the 9gram clas will be fine.
You can use any PWM pin or fan output.Is that your way to avoid oozing?
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@o_lampe said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord As long as the servo reaches it's endposition without buzzing it won't draw much current while it isn't moving. So, you could use BLTouch and Servo, (but not at the same time) without an external 5V supply.
A hobby servo from the 9gram clas will be fine.
You can use any PWM pin or fan output.Is that your way to avoid oozing?
As I said it's just an experiment, just for fun...PWM pin could be an unused heater pin? Didn't they "work" at 3,3V? So it is possible to configure two servos (BLtouch and the servo) but not to use them at the same time, right?
Thanks
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@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
PWM pin could be an unused heater pin? Didn't they "work" at 3,3V? So it is possible to configure two servos (BLtouch and the servo) but not to use them at the same time, right?
We can't use the heater or fan output terminals, because they supply 12-24V. If you refer to the pins on the expansion port, then yes a servo usually works with 3.3V on the control pin.
If you also have a panelDue, it might be better to use an external 5V circuit for the servo. -
@o_lampe said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
PWM pin could be an unused heater pin? Didn't they "work" at 3,3V? So it is possible to configure two servos (BLtouch and the servo) but not to use them at the same time, right?
We can't use the heater or fan output terminals, because they supply 12-24V. If you refer to the pins on the expansion port, then yes a servo usually works with 3.3V on the control pin.
If you also have a panelDue, it might be better to use an external 5V circuit for the servo.I also have an external 5V circuit so this is not a problem. I thought to use a heater pin in the expansion board but can a servo be driven with 3,3V?
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@thedragonlord see https://duet3d.dozuki.com/Wiki/Using_servos_and_controlling_unused_IO_pins
Ian
TronXY X5S with Duet 3 MB6HC and Roto toolboard : Cartesian bed-slinger with Duet 3 Mini 5+ WiFi and 1LC : RRP Fisher Delta v1 with Duet 2 Maestro : Polargraph with Duet 2 WiFi
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@droftarts said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord see https://duet3d.dozuki.com/Wiki/Using_servos_and_controlling_unused_IO_pins
Ian
Uh, I completely missed this page!!
Thanks a lot!
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@o_lampe said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
PWM pin could be an unused heater pin? Didn't they "work" at 3,3V? So it is possible to configure two servos (BLtouch and the servo) but not to use them at the same time, right?
We can't use the heater or fan output terminals, because they supply 12-24V. If you refer to the pins on the expansion port, then yes a servo usually works with 3.3V on the control pin.
If you also have a panelDue, it might be better to use an external 5V circuit for the servo.I saw that the servos have 3 wires, I suppose +V, Gnd and Signal, for +5V and GND i use the external power, but could the 3,3V signal from the heater pin in the expansion board drive the servo's signal pin?
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@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
but could the 3,3V signal from the heater pin in the expansion board drive the servo's signal pin?
yes
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@t3p3tony said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
but could the 3,3V signal from the heater pin in the expansion board drive the servo's signal pin?
yes
excellent, thanks, what other pin in the expansion connector can I use for it? Heater 3 is already allocated by the BLTouch
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@thedragonlord to add, ensure your grounds are connected between the external supply and the Duet,
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@t3p3tony said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord to add, ensure your grounds are connected between the external supply and the Duet,
Yes, the external supply is a stepdown wich input is the 24VDC from the board's power supply so it's already ground-connected with the board itself. I've modified my previous post so maybe you haven't read my last question: what expansion connector pin can I use to drive the servo? heater3 is already allocated by bltouch
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@t3p3tony said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord to add, ensure your grounds are connected between the external supply and the Duet,
I have installed the servo using the heater 7 pin in the expansion connector, correctly configured it and it works but now the bltouch doesn't work at all... I though that two servos can be configured in the same board but they can't work at the same time. Have I misunderstood? Only one servo can be configured and working?
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@thedragonlord you can configure and run more than one servo but they must have different GpOut port numbers. The port number is the S parameter in the M950 command and the P parameter in the M280 command.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord you can configure and run more than one servo but they must have different GpOut port numbers. The port number is the S parameter in the M950 command and the P parameter in the M280 command.
excellent, thanks
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@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
but they can't work at the same time
To clarify that: they can work at the same time, but it might overload the internal 5V supply. (I wouldn't dare to try, since it can kill the Duet)
With a strong external 5V source, you could drive more servos -
@o_lampe said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
but they can't work at the same time
To clarify that: they can work at the same time, but it might overload the internal 5V supply. (I wouldn't dare to try, since it can kill the Duet)
With a strong external 5V source, you could drive more servosI have an external 5V step down connected to the main 24Vdc power supply to power them
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@dc42 said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord you can configure and run more than one servo but they must have different GpOut port numbers. The port number is the S parameter in the M950 command and the P parameter in the M280 command.
is it possible to change the angular speed for the movement?
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@thedragonlord Angular speed of a servo depends on Voltage. But a low voltage makes it weaker, too.
You can also slow it down by writing a macro that changes the angle step_by step with a pause between, but that's not a smooth slow move. -
@o_lampe said in is it possible to use a little servo with Duet 2 WiFi?:
@thedragonlord Angular speed of a servo depends on Voltage. But a low voltage makes it weaker, too.
You can also slow it down by writing a macro that changes the angle step_by step with a pause between, but that's not a smooth slow move.ok, thanks
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@thedragonlord said in is it possible to use a little servo with Duet 2 WiFi?:
is it possible to change the angular speed for the movement?
There are plug-in gizmos to slow down servos, used by radio-control planes that want (for example) the undercarriage to retract at something like a realistic scale speed even if teh transmitted signal is just 'up' or 'down'. They simply plug between the receiver and the servo, so I don't see why you couldn't plug one between the Duet board and the servo.
See https://www.youtube.com/watch?v=oGJ7ymBBa2c from about 1:45 for example (but I have no idea what he's saying - maybe he's saying this unit is no good at all).
